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AP EAMCET202422 May 2024Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

In which of the following sets, elements are not correctly arranged with the property shown in brackets?

Options

  1. AS Se O (Electron gain enthalpy)
  2. BF O Cl (Electronegativity)
  3. CNa Li Al (Metallic radius)
  4. DNa K Ba (Metallic nature)

Correct answer

D. Na K Ba (Metallic nature)

Step-by-step solution

Electron gain enthalpy:- In a group there is decrease of electron gain enthalpy in general but for p-block elements only the EA ₁ of second period element is less than EA ₁ of third period element. The third period have larger size and vacant 3d orbitals, which can accommodate incoming electron easily. So order will be S Se 0 Electronegative along a period left to right increases and in a group it is decreases. F O Cl Metallic radius in a periodic table from left to right it is decrease and top to bottom it is incr

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